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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build race
// Public race detection API, present iff build with -race.
package runtime
import (
"unsafe"
)
func RaceRead(addr unsafe.Pointer)
func RaceWrite(addr unsafe.Pointer)
func RaceReadRange(addr unsafe.Pointer, len int)
func RaceWriteRange(addr unsafe.Pointer, len int)
func RaceSemacquire(s *uint32)
func RaceSemrelease(s *uint32)
// private interface for the runtime
const raceenabled = true
func raceReadObjectPC(t *_type, addr unsafe.Pointer, callerpc, pc uintptr) {
kind := t.kind & kindMask
if kind == kindArray || kind == kindStruct {
// for composite objects we have to read every address
// because a write might happen to any subobject.
racereadrangepc(addr, t.size, callerpc, pc)
} else {
// for non-composite objects we can read just the start
// address, as any write must write the first byte.
racereadpc(addr, callerpc, pc)
}
}
func raceWriteObjectPC(t *_type, addr unsafe.Pointer, callerpc, pc uintptr) {
kind := t.kind & kindMask
if kind == kindArray || kind == kindStruct {
// for composite objects we have to write every address
// because a write might happen to any subobject.
racewriterangepc(addr, t.size, callerpc, pc)
} else {
// for non-composite objects we can write just the start
// address, as any write must write the first byte.
racewritepc(addr, callerpc, pc)
}
}
//go:noescape
func racereadpc(addr unsafe.Pointer, callpc, pc uintptr)
//go:noescape
func racewritepc(addr unsafe.Pointer, callpc, pc uintptr)
type symbolizeContext struct {
pc uintptr
fn *byte
file *byte
line uintptr
off uintptr
res uintptr
}
var qq = [...]byte{'?', '?', 0}
var dash = [...]byte{'-', 0}
// Callback from C into Go, runs on g0.
func racesymbolize(ctx *symbolizeContext) {
f := findfunc(ctx.pc)
if f == nil {
ctx.fn = &qq[0]
ctx.file = &dash[0]
ctx.line = 0
ctx.off = ctx.pc
ctx.res = 1
return
}
ctx.fn = funcname(f)
file, line := funcline(f, ctx.pc)
ctx.line = uintptr(line)
ctx.file = &bytes(file)[0] // assume NUL-terminated
ctx.off = ctx.pc - f.entry
ctx.res = 1
return
}
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